[css] How to write :hover condition for a:before and a:after?

BoltClock's answer is correct. The only thing I want to append is that if you want to only select the pseudo element, put in a span.

For example:

<li><span data-icon='u'></span> List Element </li>

instead of:

<li> data-icon='u' List Element</li>

This way you can simply say

ul [data-icon]:hover::before {color: #f7f7f7;}

which will only highlight the pseudo element, not the entire li element

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